Deodorant cosmetic stick composition

ABSTRACT

This invention provides a deodorant cosmetic stick product which has a translucent or transparent light transmitting appearance. The cosmetic stick has a content of ingredients such as propylene glycol, sodium stearate, dimethicone copolyol, Triclosan, Pentadoxynol-200, and water. An invention deodorant cosmetic stick has excellent esthetics when applied underarm, such as smoothness and a comfortable dry feel, and without a visually perceptible residue.

CROSS-REFERENCE TO RELATED APPLICATIONS

The subject matter of this patent application is related to thatdisclosed in copending patent application Ser. No. 08/503,939, filedJul. 19, 1995; Ser. No. 08/526,269, filed Sep. 13, 1995; and Ser. No.08/534,819, filed Sep. 27, 1995.

BACKGROUND OF THE INVENTION

Numerous solid antiperspirant and/or deodorant compositions have beendescribed in the chemical and cosmetic literature. These compositionsgenerally are emulsion sticks or suspensoid sticks. Emulsion stickscontain a solution of the antiperspirant ingredient incorporated intothe stick via an emulsion. Although emulsion sticks are desirable incertain respects, they tend to be unstable, exhibit tackiness, and leavea visible residue on the skin after use. Suspensoid sticks contain thepowdered antiperspirant ingredient suspended in the stick without theuse of water or an emulsion. While suspensoids have stability, they tendto leave a white chalky residue on the skin after application.

With respect to deodorant activity, sodium bicarbonate has long beenrecognized for its deodorant properties, and has commonly been used as ahousehold deodorant. Plain powdered sodium bicarbonate, or sodiumbicarbonate diluted with talc or other filler, has been used as anunderarm deodorant as disclosed in U.S. Pat. No. 4,382,079. Otherpublications which describe cosmetic stick compositions containing abicarbonate deodorant include U.S. Pat. No. 4,822,602 and U.S. Pat. No.4,832,945.

However, the development of a practical and effective composition incosmetic stick form which has a deodorization capacity, and which iscapable of consumer acceptability, presents many factors which areunique. Because sodium and potassium bicarbonate have only limitedsolubility in water, alcohol and other solvents, the preparation of acomposition suitable for dispensing in cosmetic stick form has involvedmany processing obstacles. In addition to the problem of limitedsolubility, sodium bicarbonate often is incompatible with otheringredients of conventional stick compositions. Also, the dimensionalstability of the cosmetic stick containing sodium bicarbonate, and theesthetic appearance and the "feel" on the skin, are just a few of theadditional difficulties encountered in the preparation of a low residuedeodorant cosmetic stick product.

A recent trend is toward the development of cosmetic sticks which havelight transmitting properties, i.e., the cosmetic sticks are translucentor transparent in light transmitting properties, and engender aperceived appearance of purity.

Cosmetic sticks which are soap-based and which have a content of sodiumbicarbonate as a deodorant ingredient typically are opaque inappearance. U.S. Pat. No. 4,440,742 describes anhydrous and water-baseddeodorant cosmetic sticks which contain sodium bicarbonate, and whichvary from opaque to transparent in appearance as determined by theproportions of sodium bicarbonate and water, in combination with otheringredients.

There are difficulties associated with the preparation of water-basedcosmetic stick products which contain sodium bicarbonate as a deodorantingredient. Thus, the transparency properties do not have long-termstability. Acceptable degrees of hardness and smoothness are not readilyachieved, and an unpleasant cool-wetness is experienced when thecosmetic stick is applied to a skin surface.

There is continuing interest in the development of water-based deodorantcosmetic stick products which have a high degree of consumer acceptance.

Accordingly, it is an object of this invention to provide a cosmeticstick product which is a water-based bicarbonate-free composition havingan effective deodorizing content of a bacteriostat ingredient.

It is another object of this invention to provide a deodorant cosmeticstick product having stable transparency and affording a comfortable dryfeel when applied to a skin surface.

Other objects and advantages of the present invention shall becomeapparent from the accompanying description and examples.

DESCRIPTION OF THE INVENTION

One or more objects of the present invention are accomplished by theprovision of a deodorant cosmetic stick product with transparency whichcomprises (1) about 40-70 weight percent of polyhydric alcoholingredient, (2) about 2-8 weight percent of hydrophilic silicone-polyolclarifier-surfactant ingredient, (3) about 3-10 weight percent of C₁₄-C₂₂ fatty acid salt ingredient, (4) about 0.01-0.5 weight percent ofbacteriostat ingredient, and (5) about 24-64 weight percent of water;wherein the weight ratio of water:silicone polyol ingredients is betweenabout 3-12:1, and wherein the deodorant stick product has a penetrationvalue between about 2-6.

The term "transparency" as employed herein refers to invention cosmeticstick products which have translucent or transparent light transmittingproperties.

The term "transparent" refers to a clear body which has the property oftransmitting light without appreciable scattering, so that objectsbeyond are entirely visible.

The term "translucent" refers to a body which is partly transparent. Thebody admits and diffuses light, so that objects beyond cannot be clearlydistinguished.

The term "opaque" refers to a body which is impervious to visible light.An opaque body lacks any degree of transparency.

The polyhydric alcohol ingredient is selected from organic compoundswhich contain about 2-6 carbon atoms, and about 2-6 hydroxy groups.Illustrative of polyhydric alcohols are ethylene glycol, propyleneglycol, trimethylene glycol, butylene glycol, diethylene glycol,dipropylene glycol, glycerin, sorbitol, and the like, and mixturesthereof. Preferred polyhydric alcohols are those which arewater-miscible in all proportions such as ethylene glycol, propyleneglycol, diethylene glycol, dipropylene glycol, and glycerin.

An essential aspect of a present invention cosmetic stick product is acontent of a hydrophilic silicone-polyol clarifier-surfactantingredient. The silicone-polyol ingredient is selected from a specificstructural type of silicone nonionic surfactant polymers, havingmultiple polyoxyalkylene sidechains which impart hydrophilic propertiesto the clarifier-surfactant ingredient.

The term "hydrophilic" as employed herein refers to a water-dispersiblesilicone-polyol ingredient which has a water-solubility of at leastabout two grams per one hundred grams of water at 25° C.

Illustrative of hydrophilic silicone-polyol clarifier-surfactantingredients are dimethicone copolyol type of polymers, which includecommercial products such as Dow Corning 193, GE SF-1288, Abil B 8847(Goldschmidt), Alkasil NE 58-50 (Rhone-Poulenc), Amersil DMC-287(Americol), KF 353A (Shin Etsu), Masil i066D (PPG/Mazer), SiliconeCopolymer F-754 (Wacker), Sibwet L-7000 (Union Carbide), and the like;and similar hydrophilic silicone-polyols as listed in the CFTAInternational Cosmetic Ingredient Dictionary (Fourth Edition),incorporated by reference.

The hydrophilic silicone-polyol clarifier-surfactant ingredientcontributes important advantages to a present invention cosmetic stickproduct. The silicone-polyol ingredient enhances the transparency of thecosmetic stick, and stabilizes the degree of clarity over an extendedperiod of six months or longer under normal storage and usageconditions.

The silicone-polyol ingredient has a gelling effect, and increases thehardness of the cosmetic stick. The silicone polyol ingredient alsofunctions as a compatibility enhancing agent, which improves thehomogeneity of the diverse inorganic and organic constituents in thesolid matrix.

Other advantages of the silicone-polyol ingredient are apparent when aninvention cosmetic stick product is applied to an underarm skin area.There is ease and smoothness of application, because of the physicalglidability of the silicone-polyol ingredient. There is an improvementin other esthetic values as well, such as a reduction in the unpleasantcool-wetness typical of cosmetic stick usage. The silicone-polyolingredient also is a contributing factor to the absence of a visuallyperceptible residue as characteristic of a present invention cosmeticstick product after application.

Because of the absence of a bicarbonate salt ingredient, a presentinvention cosmetic stick product can exhibit excellent clarity anddimensional stability, and provide improved esthetic appearance and"feel".

A present invention cosmetic stick product includes a hardeneringredient, which preferably is selected from C₁₄ -C₂₂ fatty acid salts.Suitable fatty acid salts include alkali metal, alkaline earth metal,aluminum, ammonium and amine salts of fatty acids such as myristic,palmitic, stearic, behenic, oleic, linoleic, linolenic, and the like,and mixtures thereof. Illustrative of specific fatty acid salts aresodium stearate, potassium stearate, aluminum monostearate, sodiumoleate, sodium palmitate, sodium behenate, diethylamine stearate,triethylamine stearate, triethylamine oleate, and the like.

A present invention cosmetic stick product also includes between about0.01-0.5 weight percent, preferably about 0.1-0.4 weight percent, of abacteriostat ingredient. The bacteriostat functions as a deodorant bypreventing bacterial generation of malodorous degradation byproductsfrom perspiration. Typical bacteriostatic compounds include Triclosan(Ciba-Geigy), Chloracel (Reheis Chemical Company), zinc phenolsulfonate,dichloro-m-xylenol, sodium N-lauroyl sarcosine, and the like.

A present invention cosmetic stick product can contain one or moreoptional ingredients such as clarifying agents, antiperspirants,fragrances, colorants, and the like.

Between about 0.5-5 weight percent of a clarifying agent can be includedas an optional ingredient. Suitable clarifying agents includePentadoxynol-200 (RTD Chemicals Corp.), tetra(hydroxypropyl)diamine(Quadrol, BASF), 2-amino-2-methylpropanol (AMP, Angus Chemical Company),2-amino-2-hydroxymethyl-1,3-propanediol (Tromethamine, Sigma ChemicalCompany), and the like.

Between about 0.1-3 weight percent of a fragrance can be included as anoptional ingredient. The selected fragrance ingredient is one which doesnot adversely affect the clarity of the cosmetic stick product, andpreferably which contributes an odorant masking effect. Fragrancestypically are organic compounds of specific type structures, whichinclude phenolic materials, essential oils, synthetic oils, aldehydesand ketones, polycyclic compounds, esters, and alcohols. Specificfragrances are illustrated by linalyl acetate, isopropyl myristate,cedryl acetate, myrcenyl acetate, and other compounds such as thoselisted in U.S. Pat. No. 5,114,717; incorporated by reference.

Between about 0.005-0.0025 weight percent of a colorant can be includedas an optional ingredient. Typical colorants are exemplified byFD&C-type dyes and lakes as illustrated in the Examples.

A present invention deodorant cosmetic stick product can be produced byblending the ingredients in a prescribed order of addition.

In a general procedure, the silicone-polyol, fatty acid salt,bacteriostat and optional ingredients are added to propylene glycol withheating to form a solution. The propylene glycol solution then isblended with water at about 90° C. to form a homogeneous liquid medium.The warm liquid medium is poured into molds, and the molded units arecooled to room temperature to form rigid structures.

The hardness of a present invention cosmetic stick can have a valuewhich varies in the range between about 2-6, and preferably is in therange between about 2.3-3.3.

The penetration values (in millimeters) of the cosmetic stick productsdescribed herein are measured with a Universal Penetrometer, ModelTS-73510 AN-2 (Precision Scientific Inc.).

The penetration values are obtained by following a standardizedprocedure in accordance with ASTM Method D217-94.

The following examples are further illustrative of the presentinvention. The components and specific ingredients are presented asbeing typical, and various modifications can be derived in view of theforegoing disclosure within the scope of the invention.

EXAMPLE I

This Example illustrates the preparation of a translucent deodorantcosmetic stick product in accordance with the present invention.

    ______________________________________                                        Ingredients        Weight percent                                             ______________________________________                                        Part 1                                                                        D.I. water         35.00                                                      Part 2                                                                        propylene glycol   50.27                                                      Irgasan DP300.sup.(1)                                                                            0.28                                                       Dow Corning 193.sup.(2)                                                                          4.00                                                       Part 3                                                                        Clarit PDP-200.sup.(3)                                                                           2.50                                                       OP-100V.sup.(4)    6.00                                                       Part 4                                                                        D&C Green #5 (0.1% solution)                                                                     0.50                                                       fragrance.sup.(5)  1.45                                                       ______________________________________                                         .sup.(1) Triclosan (CibaGeigy).                                               .sup.(2) Hydrophilic dimethicone copolyol.                                    .sup.(2) Pentadoxynol200 (RTD Chemicals Corp.).                               .sup.(4) Sodium stearate (RTD Chemicals Corp.).                               .sup.(5) Sobica Deofresh RH 1160 Mod (Takasago).                         

The triclosan and dimethicone copolyol are added to the propyleneglycol, and the mixture is heated to 90° C. The Part 3 ingredients areadded to the propylene glycol, and heating at 90°-105° C. is maintaineduntil a solution is formed.

The propylene glycol solution and water are blended, and the colorantand fragrance ingredients are blended with the liquid medium (65°-70°C.).

The fluid blend is poured into Plastek 2 oz. bottom-fill cosmetic stickcontainers. The container contents are cooled to a room temperaturesolid stick over a period of 45 minutes. The solid stick is translucentin light transmitting appearance, and has an average hardness value of2.4 millimeters (ASTM Method 217-94).

EXAMPLE II

This Example illustrates the preparation of a transparent deodorantcosmetic stick product in accordance with the present invention.

    ______________________________________                                        Ingredients        Weight percent                                             ______________________________________                                        Part 1                                                                        D.I. water         40.00                                                      Part 2                                                                        propylene glycol   41.77                                                      dipropylene glycol 3.00                                                       Irgasan DP300.sup.(1)                                                                            0.28                                                       Dow Corning 193.sup.(2)                                                                          5.00                                                       Part 3                                                                        Clarit PDP-200.sup.(3)                                                                           3.00                                                       OP-100V.sup.(4)    5.00                                                       Part 4                                                                        D&C Green #5 (0.1% solution)                                                                     0.50                                                       fragrance.sup.(5)  1.45                                                       ______________________________________                                         .sup.(1) Triclosan (CibaGeigy).                                               .sup.(2) Hydrophilic dimethicone copolyol.                                    .sup.(3) Pentadoxynol200 (RTD Chemicals Corp.).                               .sup.(4) Sodium stearate (RTD Chemicals Corp.).                               .sup.(5) Sobica Deofresh RH 1160 Mod (Takasago).                         

The ingredients are blended in the manner described in Example I to forma batch of packaged cosmetic stick products.

The solid stick is transparent in light transmitting appearance, and hasan average hardness value of 2.9 millimeters (ASTM Method D217-94).

EXAMPLE III

This Example illustrates the preparation of a translucent deodorantcosmetic stick product in accordance with the present invention.

    ______________________________________                                        Ingredients        Weight percent                                             ______________________________________                                        Part 1                                                                        D.I. water         35.00                                                      Part 2                                                                        propylene glycol   50.27                                                      Irgasan DP300.sup.(1)                                                                            0.28                                                       GE SF-1288.sup.(2) 4.00                                                       Part 3                                                                        Clarit PDP-200.sup.(3)                                                                           2.50                                                       OP-100V.sup.(4)    6.00                                                       Part 4                                                                        D&C Green #5 (0.1% solution)                                                                     0.50                                                       fragrance.sup.(5)  1.45                                                       ______________________________________                                         .sup.(1) Triclosan (CibaGeigy).                                               .sup.(2) Hydrophilic dimethicone copolyol.                                    .sup.(3) Pentadoxynol200 (RTD Chemicals Corp.).                               .sup.(4) Sodium stearate (RTD Chemicals Corp.).                               .sup.(5) Sobica Deofresh RH 1160 Mod (Takasago).                         

The ingredients are blended in the manner described in Example I to forma batch of packaged cosmetic stick products.

The solid stick is translucent in light transmitting appearance, and hasan average hardness value of 2.4 millimeters (ASTM Method D217-94).

EXAMPLE IV

This Example illustrates the preparation of a transparent deodorantcosmetic stick product with an increased bicarbonate content inaccordance with the present invention.

    ______________________________________                                        Ingredients        Weight percent                                             ______________________________________                                        Part 1                                                                        D.I. water         42.00                                                      Part 2                                                                        propylene glycol   37.77                                                      glycerin           5.00                                                       Irgasan DP300.sup.(1)                                                                            0.28                                                       GE SF-1288.sup.(2) 4.00                                                       Part 3                                                                        Clarit PDP-200.sup.(3)                                                                           4.00                                                       OP-100V.sup.(4)    5.00                                                       Part 4                                                                        D&C Green #5 (0.1% solution)                                                                     0.50                                                       fragrance.sup.(5)  1.45                                                       ______________________________________                                         .sup.(1) Trichlosan (CibaGeigy).                                              .sup.(2) Hydrophilic dimethicone copolyol.                                    .sup.(3) Pentadoxynol200 (RTD Chemicals Corp.).                               .sup.(4) Sodium stearate (RTD Chemicals Corp.).                               .sup.(5) Sobica Deofresh RH 1160 Mod (Takasago).                         

The ingredients are blended in the manner described in Example I to forma batch of packaged cosmetic stick products.

The solid stick is transparent in light transmitting appearance, and hasan average hardness value of 3.1 millimeters (ASTM Method D217-94).

What is claimed is:
 1. A deodorant cosmetic stick product withtransparency which comprises (1) about 40-70 weight percent ofpolyhydric alcohol ingredient, (2) about 2-8 weight percent ofhydrophilic silicone-polyol clarifier-surfactant ingredient, (3) about3-10 weight percent of C₁₄ -C₂₂ fatty acid salt ingredient, (4) about0.01-0.5 weight percent of bacteriostat ingredient, (5) about 24-64weight percent of water, and (6) about 0.5-5 weight percent ofclarifying agent; wherein the weight ratio of water:silicone-polyolingredients is between about 3-12:1, and wherein the deodorant stickproduct has a penetration value between about 2-6.
 2. A deodorant stickproduct in accordance with claim 1 which is translucent.
 3. A deodorantstick product in accordance with claim 1 which is transparent.
 4. Adeodorant stick product in accordance with claim 1 wherein thepolyhydric alcohol ingredient is ethylene glycol, propylene glycol,diethylene glycol, dipropylene glycol, glycerin, or any mixture thereof.5. A deodorant stick product in accordance with claim 1 wherein theclarifier-surfactant ingredient has a water-solubility of at least abouttwo grams per one hundred grams of water at 25° C.
 6. A deodorant stickproduct in accordance with claim 1 wherein the clarifier-surfactantingredient is dimethicone copolyol.
 7. A deodorant stick product inaccordance with claim 1 wherein the fatty acid salt ingredient is asodium, potassium, ammonium or amine salt or any mixture thereof.
 8. Adeodorant stick product in accordance with claim 1 wherein thebacteriostat is Triclosan.
 9. A deodorant stick product in accordancewith claim 1 which contains between about 0.5-5 weight percent ofPentadoxynol-200 clarifying agent.
 10. A deodorant stick product inaccordance with claim 1 which additionally contains between about 0.1-3weight percent of fragrance.
 11. A deodorant stick product in accordancewith claim 1 which has a penetration value between about 2.3-3.3.